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Hello & Happy New Year,
In order for me to accurately answer this question I will need more information on your specific hardware. Can you please provide me with the serial number of the S875?
It is typical that you cannot connect three displays at once using only the VGA and HDMI adapter simultaneously, but if you have a display port you can connect multiple displays simultaneously.
Your serial number would provide me with the ability to lookup your exact specifications and properly advise in regards ***** ***** options.